Hollow grate-bar.



E. J. GORDON. HOLLOW GRATE BAR.

APPLICATION FILED MAY 23, 1908.

Patented Mar. 23, 1909.

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ELONSO J. GORDON, OF BIG RAPIDS, MICHIGAN.

HOLLOW GRATE-BAR.

Specificationof Letters'Patent.

Patented March 23, 1909.

Application filed May 23, 1908. Serial No 434,619.

To all whom it may concern:

Be it known that I, ELoNso J. GORDON, a citizen of the United States,residing at Big Rapids, in the county of Mecosta and State of Michigan,have invented certain new and useful Improvements in Hollow Grate-Bars;and I do hereby declare the following to be a full, clear, and exactdescription of the inven tion, such as will enable others skilled in theart to which it appertains to make and use the same.

My invention relates to improvements in hollow grate bars for furnacesadapted to burn fine fuel, as saw dust, coke breeze and the like.

One object of my invention is to provide means for preventing the draftof the stack from removing the smoke and gases from the fire box beforethe combustible elements are thoroughly consumed.

Another object is to supply oxygen to the smoke and gases to facilitatetheir combustion.

Still another object is to provide means for preventing the boiler frontfrom becoming overheated.

To these ends, therefore, my invention consists in certain novelfeatures and combinations such as will be more fully describedhereinafter and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a perspective v1ew of afurnace broken away to show the grate, Fig. 2 is a detail perspectiveview of a grate bar embodying my improvements and Fig. 3 is a transversecross sectional view through a grate bar.

This invention is an improvement over the grate bar shown in my PatentNo. 824,716, dated July 3d, 1906.

In the drawings A, indicates a boiler setting, B, an ash pit, O, aboiler and D, the grate provided at intervals with the hollow blastgrate bars (1), (1), supplied with air by means of a fan (2) and conduit(3). The grate D is equipped with openings d, .d. The hollow grate barseach consist of a rectangular body portion reduced at its opposite endsas at (4), (4).. These reduced ends may be seated in the front andbridgewalls respectivel the bridgewall being shown at (5). The upperface of each bar is longitudinally grooved as at (6), (6), the divergingwalls ofthe respective grooves being provided with blast openings (7(7), arranged in staggered relation and communicating this arrangementof blast openings is to fully diffuse the air through the combustiblema- .terial on the grate, and cause it to burn more freely as well asoperating to consume the smoke and gases driven off from the burningmaterial.

' It has been found that in an ordinary grate, the draft has a naturaltendency to draw a considerable amount of the uncon sumed smoke andgases away from the fire, over the bridgewall and up the stack whichresults in black and'heavy smoke issuing from the stack, to avoid whichas well as to obtain the additional heat to be gained by burning suchescaping smoke and gas, I provide the following devices. Near theopposite ends cf each blast bar is formed an inclined Wall (8),extending transversely across the face of the bar, the walls divergingrelative to each other and being provided with one or more twyers (9),communicating with the hollow interior of the bar. These twyers arelocated in front of the brid ewall and immediately back of the frontwall of the boiler setting respectively. The object of the twyers (9) infront of the bridgewall is. to emit jets of oxygen-bearing airconstituting what I may term. a forward blast which forces the escapinggases back over the fire and supplies oxygen for their thoroughcombustion.

The purpose of the blast from the twyers at the opposite or front end ofthe bar is to prevent the boiler front from becoming overheated besidesaiding the combustion of the gases arising from the burning material. Itwill be noted that the air jets do not impinge directly against theboiler and that the inclination of the outside rows of openings (7)extending longitudinally of the bars prevents the escape of air betweenthe bars. The twyers at the opposite ends of'the bars are located in aplane above the openings (7), (7.), and the upper faces of the reducedends (4) (4), are beveled as at (10) to increase their strength andrigidity. The inclination of the walls (8) facilitates cleaning thebars.

It is obvious Having thus fully disclosed my invention, what I claim asnew is 2-- 1. The combination in a furnace having a bridge wall, of ahollow blast grate bar, the upper face of which is equipped with blastopenings and is provided at opposite ends with divergent apertured wallsrising above the upper face 01' and integral with the bar, the wallsextending transversely of the bar.

2. A hollow blast grate bar comprising a body portion having openingstherein and an apertured wall at the rear end of the bar, the wall beinginclined at an obtuse angle to the face of the body portion and formedintegral therewith.

3a A horizontally disposed hollow blast rate bar comprising a bodyportion having lbngitudinally extending corrugations, the walls of thecorrugations being provided with opposed openings, the body portion :20

having divergently inclined apertured end walls extending transverselyacross the face of the bar and integral therewith, the walls risingabove the lace of the bar.

i. A hollow blast grate bar comprising a body portion having openingstherein and an apertured wall at the rear end of the bar, the wall beinginclined at an obtuse angle to the face of the body portion and formedintegral therewith, the upper lace oi the inclined wall being slopeddown to the plane of the upper face of the body portion of the bar.

In testimony whereof, I afiix. my signature in presence of twowitnesses.

ELONSO J. GORDON Vitnesses RALPH S. \VARFIELI), J. RAY ABBEY.

